Shares of Illumina Inc. tumbled 6.3% in trading on Wednesday after Bloomberg reported that the company is in talks to acquire Grail Inc., which last week filed for its initial public offering. People familiar with the matter told Bloomberg a deal could be announced this week. Grail makes a cancer detection test. Illumina's stock is down 0.7% for the year, while the S&P 500 has gained 5.5%.
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